The fifth Blue Reflection: Sword of the Girl Who Dances in Illusions character trailer introduces Yuri Saiki.
As previously detailed, Yuri Saiki is a girl with naturally high intelligence. She takes pride in her high IQ, but pretends to be an ordinary student, recognized in school merely as someone bright. She grew up putting intelligence ahead of emotions and is unable to express her emotions well, nor is she very good at reading the emotions of others.
Watch the trailer below.